netdev - [PATCH net-next] net: phy: fix up const issues in to_mdio_device() and to_phy

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Message-ID: <2025052246-conduit-glory-8fc9@gregkh>
Date: Thu, 22 May 2025 13:21:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Lobakin <alobakin@...me>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>
Subject: [PATCH net-next] net: phy: fix up const issues in to_mdio_device() and to_phy_device()

Both to_mdio_device() and to_phy_device() "throw away" the const pointer
attribute passed to them and return a non-const pointer, which generally
is not a good thing overall.  Fix this up by using container_of_const()
which was designed for this very problem.

Cc: Alexander Lobakin <alobakin@...me>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>
Cc: Russell King <linux@...linux.org.uk>
Fixes: 7eab14de73a8 ("mdio, phy: fix -Wshadow warnings triggered by nested container_of()")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/mdio.h | 5 +----
 include/linux/phy.h  | 5 +----
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 3c3deac57894..e43ff9f980a4 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -45,10 +45,7 @@ struct mdio_device {
 	unsigned int reset_deassert_delay;
 };
 
-static inline struct mdio_device *to_mdio_device(const struct device *dev)
-{
-	return container_of(dev, struct mdio_device, dev);
-}
+#define to_mdio_device(__dev)	container_of_const(__dev, struct mdio_device, dev)
 
 /* struct mdio_driver_common: Common to all MDIO drivers */
 struct mdio_driver_common {
diff --git a/include/linux/phy.h b/include/linux/phy.h
index a2bfae80c449..bef68f6af99a 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -744,10 +744,7 @@ struct phy_device {
 #define PHY_F_NO_IRQ		0x80000000
 #define PHY_F_RXC_ALWAYS_ON	0x40000000
 
-static inline struct phy_device *to_phy_device(const struct device *dev)
-{
-	return container_of(to_mdio_device(dev), struct phy_device, mdio);
-}
+#define to_phy_device(__dev)	container_of_const(to_mdio_device(__dev), struct phy_device, mdio)
 
 /**
  * struct phy_tdr_config - Configuration of a TDR raw test
-- 
2.49.0